Multiple WSDL and .svc files

Hello

I've a WCF service which is hosted by the IIS. There I have several .svc
files which have different WSDL files. I set the WSDL location via the
externalMetadataLocation attribute in the serviceMetadata section to ensure
that the metadata of this WCF service is excactly this one im my WSDL file.
My problem is now that it works only for one WSDL file, because every
service has the same name and the same behaviourConfiguration...
But I need to set a WSDL file for every .svc file.

How can this be done?

Thanks in advance
Samuel